Abstract
The stratospheric mixing ratio of nitric oxide at an altitude of 36 km has been measured using a balloon-borne tunable diode laser (TDL) instrument operating in the 5.2-micron wavelength region. Currently the instrument operates with two TDLs, and the capability exists to measure four stratospheric species simultaneously: NO, NO2, O3, and H2O. During the NO measurements reported here, the second TDL operating near 6.2 microns was used to monitor water vapor concentration in the vicinity of the gondola by observing the 1889.57 per cm line absorption in the reference channel path length (1 m).
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